Swivel-pivot and its bearing for gun-mounts.



SWWL PWM MB [Application ed Apr. 2B,

- (No Model.)

iiNTTnn STATns PATnNT @Trient .IOI-IN J. CLARKE, OF VAS'IIINGTON, DISTRICT OF COLUMBIA, A SSIGNOR, BY MESNE ASSIGNMENTS, TO THE ACME' BALL BEARING CASTER COMPANY, OF NEV YORK, AN. Y.

SWIVEL-PIVOT AND ITS BEARING FOR .GUNwlVlOUNTSL SPECIFICATION forming part of Letters Patent No. 634,261, dated October 3, 1899.

I vimplication filed April 28, 1899. Serial No. 714,777. (No model.)

To all whom it may concern: which is commonly provided in the swivels Beit known that I, JOHN J. CLARKE, a citiof such gun-mounts and which is not part of zen of the United States, and a resident of my invention. f Vi/'ashingtom in the District of Columbia, have The ball-cupf may be fitted in any suitable invented a new and useful Improvement in manner to the screw c. It is represented as 55 Swivel-Pivots and Their Bearings for Gunseated in a concave seat in the head of the Biounts and other Structures, of which the folscrew and provided with a stem j, which is lowing isaspecieation. tightly fitted to a hole bored in the latter. This invention is particularly designed for The cup is held in place by a cap-ringk,wl1ich 1o use in mounts of rapid-iire ordnance, but is is screwed over the top of the screw c and 6o also applicable to the supporting-pivots of which has an internal fiange l, which overother structures which are required to revolve laps the edge of the ball-cup and protects the or turn about a vertical `axis-cranes or rebearing from dust and dirt. The opening of? volving derricks, for exaniple.- this Yfiange is just large enough for the pivot .i5 l will ilrst describe my invention with" refto work freely within it. The screw c is op- 65 erence to the accompanying drawings, which erated in the usual way to adjust the swivel illustrate its application to the mount of a or racer up or down.

rapid-fire gun, and will afterward briefiy ex- Inaswivel-pivotanditsbearing constructed plain its adaptation to other structures. as above described the swivel or body borne zo Figure l. representsavcrtieal sectional view by the pivot turns with great. freedom on the 7o of the gun-mount, and Fig. 2 a plan of the cenantifriction balls, which being distributed tral part of the swivel-pivot bearing containover the bottom of the cup are less liable to ing antilriction-balls -on which the said pivot bind or be crushed than when arranged in turns. grooves, as has heretofore been commonly the 2 Similar letters ot reference designate correoase when antifriction-balls have been used spending parts 1n both figures. between swivel-p1vots and their supportingn, designates the base of the mount, and Z) bearings. the swiveling body, commonly known as the In applying this invention to a derrick or racen In the lower central portion of the crane the' base of the structure will have the 3o' base there works an upright adjusting-screw ball-bearing fg fitted to it in any conven- 8o 1:,carrying the pivot-bearing, and from the ient manner, and the spherical pivot e will center of the racer there projects downward be iitted in any convenient manner to the a stem (l, to the lower end of which is secured foot'or lower portion of the revolving or turnthe hardened-'steel pivot e,thc bottom of which ing mast or pillar or swiveling portion or body 35 is of spherical form. of the structure. 85

rlhe pivot-bearing consists of a hardened- 'Vhat I claim as my invention issteel cnpf, thebottoin of the interior of which l. The combination with a base and avracer is of spherical form corresponding with that or body to swivel thereon, of a spherical pivot of the bottom of the pivot and forms a seat affixed to said body, a cup in which is aspher- 4o for auuinber of small hardened-steel antifricical seat conforming to said spherical pivot 9j' tion-ballsg g sui'iicient to cover withouterowdand containing antifriction-balls for the snp ing the entire bottom of the cup. The spherport of said pivot and swiveling body, and an ical bottom of the pivot is supported directly adjusting-screw screwing directly into the .on the balls y. The edges of the cup are base and having the said cup seated in its 45 turned inward sufiiciently to prevent. the head, substantially as herein described. 95 spreading of the balls. 2. The con'ibination with a base and a racer 'lhc pivot e may be secured to the central or body to swivel thereon,` of a spherical pivotstem f7 of the swivcling body or racer in any aflixed to said body, a cup in which is a sphersuitable manner. It is represented as seical seat conforming to said spherical pivot 5.o cured 'by screws /f to the percussion-ring i, and containing:nitil'riction-balls foi-the suploo y ort of said pivot and swiveling body, an adence of two witnesses, this 27th day of Api-il,

Justing-serew on which said cup is supported 1899. in the base, and a cap-ring applied to the head 7 of said screw to protect the cup and balls, sub- JOHN J' CLARKE' 5 stan tially as herein described. Witnesses:

In testimony that I claixn the foregoing as FREDK. IIAYNES, my invention I have signed my naine, in pres- EDWARD VIESER, 

